Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7c58e551e40e00…

MALICIOUS

PDF

74.1 KB Created: 2021-02-19 03:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dcf06c9102a6bfe43c79ad7a3ff87b65 SHA-1: 28859409a5cabb1b9b211b7eea5aff0c09d00df6 SHA-256: dc7c58e551e40e000f34c5fbdaa7be5ee899cf6f04044a766c2af4989780c5d1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains an embedded URL, identified by both heuristics and ClamAV as malicious. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the external URI and the high confidence scores from multiple detection engines suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=is+skinny+good PDF link annotation
    • http://tehnotop.space/55357270909nj23v.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/hdidCIa/bejoremarefuvamavevox.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Y9MeEsm/guitar_e_string_sounds_dull.pdfIn PDF document text
    • http://vezalijoza.22web.org/27575110557.pdfIn PDF document text
    • http://pemeturaw.iblogger.org/wakuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tupudenijusab.rf.gd/85026293112.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/jafepos.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/wiwiburux.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/nawiwavidivokewufewus.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/wazixesaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/35861680867.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/smarter_goals_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 4756 bytes
SHA-256: f00c1a9aa715017a2af766968f6e970b12c581f2df7810d2a9d653bdfafa3239
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10272 bytes
SHA-256: 247ef7cb1c6ef6af9dd709545db70e1f4d571979628f69ea7316f8efebf910f8

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